penguin

[peng-gwin, pen-]
noun Ornithology.
1.
any of several flightless, aquatic birds of the family Spheniscidae, of the Southern Hemisphere, having webbed feet and wings reduced to flippers.
2.
Obsolete, great auk.

Origin:
1570–80; origin uncertain; perhaps < Welsh pen gwyn literally, white head (referring to the great auk in its winter plumage); later misapplied to the Spheniscidae

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World English Dictionary
penguin (ˈpɛŋɡwɪn)
 
n
1.  emperor penguin See also king penguin any flightless marine bird, such as Aptenodytes patagonica (king penguin) and Pygoscelis adeliae (Adélie penguin), of the order Sphenisciformes of cool southern, esp Antarctic, regions: they have wings modified as flippers, webbed feet, and feathers lacking barbs
2.  an obsolete name for great auk
 
[C16: perhaps from Welsh pen gwyn, from pen head + gwyn white]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

penguin
1578, originally used of the great auk of Newfoundland (now extinct), shift in meaning to the Antarctic bird (which looks something like it, found by Drake in Magellan's Straits in 1578) is from 1588. Of unknown origin, though often asserted to be from Welsh pen "head" + gwyn "white" (see
Gwendolyn). The great auk had a large white patch between its bill and eye. The Fr. and Breton versions of the word are ult. from English. The book publishing company of this name is from 1935.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Improve your sense of direction as you race against a rival penguin in an icy
  maze.
The epic saga of an adorable wayward emperor penguin continues.
At a glance, it is nearly impossible to identify an individual penguin in a
  colony of several thousand.
Harnessed up and ready to dive, the fat penguin looks as though it has its own
  mini scuba tank.
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